<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body align ="center">
<h1>登陆界面</h1>
<form action = "signin" method = "post">
    用户名:<input type = "text" id = "sno" name = "username"><br/>
    密码:<input type = "password" id = "password" name="password"><br/>
    <button type = "submit" value = "确认" >确认</button>
</form>
<div id = "check"></div>

</body>
</html>